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1998 olds 88 dash heater vacuum

The heater dash cluster has the heater control,fan speeds,temp.,a/c and rear window defroster in it. The off switch is on the control selector and this is run by a vacuum. I have no power to the a/c and rear window defroster.and no main power to the fan. After removing the glove box door I see a vacuum line going to a fuse /relay pannel on the passenger side.Does this go to a switch that throws power to the main heater cluster? Also the door that changes from hot air to cold air will not open all the way. I disconnected it from the vacuum valve and the door moves freely. On the electric side I have checked fuses, changed the heater dash cluster,heater relay and fan switch. None of these changes made the heater, the a/c or rear window defroster work. If you cannot help me, can you tell me where to get a free electric and vacuum diagram on line for this car. Thank You

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  • bizzybee791 Jan 19, 2009

    I have did the same things that he has. and it seems that the off switch on the cluster is on a vacuum, is there a vacumm switch some where that supplys power to the cluster.

  • fulda65 Feb 01, 2009

    I have a 1999 Olds 88 with the same problem. All fuses OK. Changed blower relay and everything is still dead. Also showing a low vacuum engine code. Has to be a vacuum switch somewhere.



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On the right side of steering colum there is a plug. there is a wire that gets warm and loses connection. check by moving plug. my heater and ac would not work and caused the vacume swith to stay open.

Posted on Sep 26, 2009


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